Or alternatively, can it even discharge fast enough to provide a meaningful enough amount of electricity?

What does the charge/ discharge cycle do to the integrity of the concrete?

What special conditions are necessary for is curing? Whats the yield? Because the consequences of having a 45 cubic meter block of concrete that was supposed to be a battery sitting in my yard but isn't are not trivial.

Whats the carbon footprint of adding 45 additional cubic meters of concrete to every structure? It takes a shit ton of energy to rip off the necessary electrons from lime stone to make lime.